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| author | Martin Braun <martin.braun@ettus.com> | 2016-10-25 15:09:06 -0700 |
|---|---|---|
| committer | Martin Braun <martin.braun@ettus.com> | 2016-10-25 16:55:54 -0700 |
| commit | abee6b1929390e4824964f9fc2b3ed538dc3c679 (patch) | |
| tree | 7d7a1748f4168da0e1254b115f6d56c7bbbc0552 /host | |
| parent | 2a0e0612dcc9a477e690addae3fd8b42ed301f26 (diff) | |
| download | uhd-abee6b1929390e4824964f9fc2b3ed538dc3c679.tar.gz uhd-abee6b1929390e4824964f9fc2b3ed538dc3c679.tar.bz2 uhd-abee6b1929390e4824964f9fc2b3ed538dc3c679.zip | |
x300: Throttle MTU to 3000 for PCIe to avoid underruns
This is a temporary workaround to make PCIe available on lower rates.
Diffstat (limited to 'host')
| -rw-r--r-- | host/lib/usrp/x300/x300_impl.hpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/host/lib/usrp/x300/x300_impl.hpp b/host/lib/usrp/x300/x300_impl.hpp index ee42dcf3e..5d3fa4fed 100644 --- a/host/lib/usrp/x300/x300_impl.hpp +++ b/host/lib/usrp/x300/x300_impl.hpp @@ -54,7 +54,10 @@ static const size_t X300_RX_SW_BUFF_SIZE_ETH_MACOS = 0x100000; //1Mib //where an element is 8 bytes. For best throughput ensure that the data frame fits in these buffers. //Also ensure that the kernel has enough frames to hold buffered TX and RX data static const size_t X300_PCIE_RX_DATA_FRAME_SIZE = 8184; //bytes -static const size_t X300_PCIE_TX_DATA_FRAME_SIZE = 8192; //bytes +//static const size_t X300_PCIE_TX_DATA_FRAME_SIZE = 8192; //bytes +// This is a temporary solution: We're throttling PCIe MTU to avoid +// underruns on Tx. Once we solve it on the FPGA side, need revert this commit. +static const size_t X300_PCIE_TX_DATA_FRAME_SIZE = 3000; //bytes static const size_t X300_PCIE_DATA_NUM_FRAMES = 2048; static const size_t X300_PCIE_MSG_FRAME_SIZE = 256; //bytes static const size_t X300_PCIE_MSG_NUM_FRAMES = 64; |